Lighting fixture



Jan. 29, 1929.

L. LAZAR LIGHTING FIXTURE Filed Apri l 15. 1925 5 Sheets-Sheet LEo/v LAZAR 3151 610mm,

Jan. 29, 1929 L. LAZAR LIGHTING FIXTURE Filed April 15. 1925 3 Sheets-Sheet 2 wuwtoz Lao/v nz/m Patented .lan. 29, 1929,"

LEON LAZAR, on NEW YORK, N. TION,

Y., ASSIGNOR'TO LAZAR HOLDING someone or new YORK,-I-T. Y. v 1

LIGH ING FIX'rURE.

Application filed April 15, 1925-. Serial .No. 23,303.

' adaptedfor dental use, which comprises a centrated light rays at subs plurality of adjustably mounted lights and means for simultaneously concentrating the rays from each light at a common point.

' A further object of the invention is to pro vide alighting fixture of thischaracter with a universal supporting bracket,the latter cooperating with said meansi'or controlling the lights to enable an operator to locate the contantially any plane or elevation required by lighting fixtures of this character. 7

Further objeets of the invention will appear in connection with the following de-. scription and in the accompanying drawings, in which, a

Figure 1 is a front elevational View of my 7 improved lighting fixture showing an installation of four lights; Figure 2 is a side elevational View of the fixture showing the parts on alarger scale and partly broken away to disclose otherwise hidden parts; Fi ure. 3 is a detail view of the Control cam for the lights; Figured is a detail plan view of the universal connection for supporting the fixture; Figure 5 is a view similar to Figure 2 showing a modified control for adjusting'the lights; and Figure 6 is an elerational view of: the same. v

Referring to the drawings and particularly to Figures'l to 4-, 1O denotes a tubular base support and 11 a tubular stem adjustable in said base. The stem 11 may be of any convenient length, preferably reaching an, elevation well above the seat of a dental chair, for instance. An elbow 12 is carried by the upper end, and supports a lateral yoke portion 13 between the parallel arms 1 1 of which fibre washers 15 are arranged, the latter ems bracing the shank 16 of'a union 17. From the opposite side of. the union, projects an upright shank 18 which is therefore disposed at right angles to the shank '16 and receives-the yoke portion .19 of a tubular member 20. Similar fibre washers are disposed between the yoke portion 19 and interposed shank 18. Both of the yoke portions 13 and 19 andtheir respective shanks 16 and 18 are pivotally con nected by means of bolts 21. j The tubular member 20 is open at its outer end anda stub v out in the periphery oi'theostub pin an, This constructioirwill enable the pin 22 to rotate without becoming detached from the tubular member 2Q. The structure thus far described relates only to the universal con,- nections torthe fixture and it will' be "clear that lateral andverticalarcuate adjustment may be effected by the connection' wviththe union 1?, while any circular adjustment repin 22 is rotatably carried inxthe bore, -T-ho member 20 is further provided with a tan gentially"disposedpin 23 which is partially embraced by the walls of'a continuous groove quired for the fixture 'inay be taken care of by thetubular "support for the stub pin 22;

Referring now to the"lightingffixture;2 5 denotes a cover plate disposedfon'; the end of the pin 22, the plate 25b'eingdetachably connected to a housing 26, which-comprises a rectangularlyshaped hollow member hav ing its two side walls and top and'bottom walls provided with exteriorly threadedextensions 27 having axial bores 981 "The front wall of the housing'26 is similarly provided with an extension 29 having a threaded bore being adjusted axially by rotation thereo"f The inner end of the shaft 31'carriesa cone shaped cam 32 and the outer end supports a sprocket wheel 33, t i

Each threaded extension27 .carries'a tubu-' lar extcnsimrarm 34: interiorly threaded at. both ends, and at the outer end thereof is arranged a'collar or'cap 35 from which pro jects the arms of a yoke 36. Pivotally mounted betwen the arms or the yoke 36 is a lightcomprising a cylindricalcasing 37 having a condenser lens 38 at one end andan electric socket 39 at the other, Assuming" that the normal position oi? a casing 37 is on the'horizo'ntal, as'illustrated in Figure any adjustment ofthe light about its pivot to concentrate its lightrays on a desired point is accomplished by a mechanism comprising a U-shaped bracket 40 attached to the periphcry of the casing 37 adjacent and between the arms or" the yoke 36. The uprightpor tions 41 of the bracket are disposed longi- 30a) receive a threaded shaft 31 capable of tudinally ofthe casing and are provided with Yieldably mounted in the :extensio arm 34 and projecting axially throughout the length of the latter is an adjustable rod 43, the inner end thereof being extensible in the bore 28 and'terminating in a round end 44 Which is yieldably held in engagement With inclined siirface of the cam 32 a coil spring 47, one end thereof being seated against a Washer 48 arranged in the outer threaded end of the' extension 34 and the other end yield.

ably engaging against a Washer 49 fixed to file rod 43 at a point spaced substantially from the inner end. Then the light casing 37 is on the horizontal plane, shown in Figure 2, the pins 46 are disposed in the lOW end of the openingsor slots 42 and as the cone shaped cam 32 is vvithdravvn outyvardly the rods 43 follow inwardly and toivards the center of the honsing 26. This operation causes the pins 46 to 'ride upwardly in the slots42and consequently rock the light casing 37 about its pivotal support in the yoke member 36. Since each light depends upon the cam 32 to enable the individual springs 47 to act upon the rods 43, the relative movement of each light Will be exactly the same. .Then, at a mid point- Where the axis of the light intersect a highly illuminated disc of light will appear upon any object upon Which the disc of light is focused.

The control for any movement of the lighting fixture including the focusing device, comprises. a collar 50 which may be attached to anyone of the extension tubes 34, and Which is provided with aprojection and stub-bearing pin 51.- Rotatably mounted on the pin 51 is a handle 52 having a grip 53 at its outer free end and a sprocket Wheel 54 at the inner end adj acent the collar 50. The sprockets 54 and 33 are aligned to receive an endless sprocket chain 5. It will be clear that any rotary adjustment of the handle 52 will impart an axial movement to the shaft 31 thereby changing the position of the cam. 32 as already explained. Simultaneously \vith'this rotary adjustment, the handle may be made to move the entire fixture and consequently regulate the intersecting axis of the lights at any convenient location.

3 Referring now to the modified embodiment of my invention, illustrated particularly in Figures 5 and 6, it will be clear that-the mechanism at the outer ends 'ofthe extensions is identical with that used in connection With the preferred 01m, except that the connection 45 is provided at its inner end with a cylindrical portion 56 having a threaded bore 57 to receive the threaded end of a rod 58 projecting through the extension tube 34. It is intended, according to this construe tion, that the normally upright extension tubes ,34 will remain permanent and in that case the rod 58 Will extend through two extensions. A housing 59 supports the extensions 34 and is provided With detachable side cover plates 60 which may carry a second pair of extension tubes 34, projecting at right angles to and on the same plane With the upright pair. The shaft or rod 58 in this construction merely rotates and carries a miter gear 61 Within the housing 59, the gearhl meshing With tivo oppositely disposedmite': gears 62 Which are fixed to the ends of rods 63, the latter being disposed axially of the horizontal extensions and adapted to operate lights arranged at the ends of the same. In.

order to impart axial 1noven'1e'nt to the cylindrical portions 56 at the ends 'of the exten sions, the rods 58 and 63 arerotated through their miter gear eonnectionswith the upright rod 58, which is rotated by a handle cf'o'nncction similar to that already described in connection with the preferred forni, ,that is in so far as the mounting and rotary shaft 51 is concerned, but in the modified embodiment the shaft 51 is offset to one side of the ex tension 34 and'carries a pinion gear 64 in mesh With a pinion gear 65 fixed on the rod or shaft 58. The housing 66 for the handle connection may be of any suitable design; in the present instance, hoWeveiu' I have divided the extension 34 and in'serte'd therebetween a casting h'av1ng" flanged por tions to receive'an'd be secured to similar flanges 67 carried by the adjacent ends of the extension. 3

It ivill be clear that in either embodiment of my invention the two horizontal extensions and their lights be removed by simply detaching the extensions from thehousin-gs and substituting for the cover plates other plates which do not include the projections for receiving the extensions.

The operation of the device is substantially as follows: i

It will be assumed for the present purpose that the fixture is arranged Within easy reach of a dentist who has a patient seated in the usual dental chair with the head tilted back to bring the mouth in correct 'positi'on- The handle 52 is rotated by one hand of the dentist until all of the lights are directed approximately towards a common center The fixture as a Whole is then tilted about its universal connectionby bearing, in. the desired direction, upon the handle. Further rotary adjustment of the handle should then bring the discs of light from each light into register,'all of which Will result in a plurality of disc-shaped illuminated 'spotssup'erposed in the mouth of the patient. It will be clear that since the light rays are directed from more than one an'gle, the month Willstill remain illuminated in the event that an object obstructs one of the light sources.

' center.

It Will be further clear that light-ing fixtures of this character may be carried by suit said spot lights to concentrate their rays at a relatively close common point.

2. A lighting fixture of the character de-' scribed, comprising aplurality of adjustable spot lights arranged as a unit, means for simultaneously adjusting said spot lights towards a relatively close common center, means mounted for rotary adjustment and for supporting said unit, and universal connecting means between the unit and supportlngy means. j

3. A lightingfixture of the character described comprising a housing mounted for rotary adjustment, a plurality of ad justable spot lights carried by and spaced from the housing, means for adjusting said spot lights towards or away from a relatively close common center, and a supporting frame for said hous1ng,compr1smg a collapsible column, and a universal connection for one endof said column connected With said fixture.

4. In a lighting fixture of the character described, the combination of a supporting frame, a housing mounted for rotary adjustment on said frame, radially disposed members carried by said housing, adjustably mounted spotlights carried by said members, I

and means for simultaneously adjusting said lights relative to a common center and appropriately close objective. v

5. In a lighting fixture of the character described, the combination of asupporting frame, a housing mounted for rotary adjustment at the end thereof, radial arms attachably carried by said housing, a spot light adrotary ad ustment to support said extenjustablv mounted at the end ofeach arm, axially adjustable connection at the ends of said with said connections to'simultaneously adjust all of said lights relative to a common 6. In a lighting fixture of the character described, the combination of a supporting frame, a housing at the end thereof, radial extensions attachably carried by said housing, adjustable spot lights carried bysaid extensions, means disposed Within said housing and co-operating With the spot lights to simultaneously adjust the latter relative to a common center, and means carried by one of said extensions to control said'last named means.

7. In a lighting fixture of the character described, the combination of a housing mounted for rotary adjustment, radial extensions therefor, adjustable spot lights for said extensions, means disposed in said housing and radial extensions to simultaneously adjust said lights to concentrate or spread their rays on a relatively close objective, and a handle operatively connected to said last named means. v

8. In a lighting fixtureof the character described, the combination of a supporting frame, a universal unit atthe endthereof, a housingcarried by said unit, radial extensions for said housing, adjustable spot lights for said extensions, means disposed in said housing and operatively connected to said lights for imparting simultaneous adjustment to each light, and a handle control attached to one extension and operatively connected to said last named means. I

9. Ina lighting fixture of the character described, the combination with a housing mounted for rotary adjustment and having radially spaced extensions, a yoke at the end of each extension, of a spot light pivotally arranged in said yoke,'and means axially adjustable in said extension and connected to the light to adjust the axis of the latter.

10. In a lighting fixture of the character described, the combination With a housing mounted for rotary adjustment and having radially spaced extensions, a yoke for each extension, a spot light pivotally arranged in said yoke for concentrating or spreading their rays on a relatively close objective, comprising a casing having a projection provid ed with inclined slot, a rod adjustable in said extension and having a projection disposed in said slot, whereby relative adjustment of said projection Will cause the casing to rock and change the relative 11. In a lighting fixture of the character.

described, the combination ofradially disposed adjustable spot lights, extensionssupporting said lights, a housing mounted for sions, rods disposed in-saidextensions and operatively connected at'their outer ends to rock said lights to concentrate'or spread their rays over a relatively close objective, and means dlsposed in said housing and engaging iis said rodsto impart simultaneous movement thereto to adjust said lights relative to a common center.

rods disposed in each extension and normal ly engaged With the surface of said 021111 and connecting means between the axially adjustable "reds and said lights.

13. A lighting fixture, as claimed in claim 11, including a handle control carried by one extensi'on and means connecting said handle LEON LAZAR. 

